What percentage of alcohol is allowed to drink when you drive?

Question:
What percentage of alcohol is allowed to drink when you drive?
Answer:
In Japan, you are not allowed to have any alcoholic drink when you drive!
(As we heard that in Switzerland, up to 0.5% is allowed)
It is said that Japanese have less digestive enzymes for alcohol compared with European. We get drunk easily.
Pic: http://www.advertolog.com/motor-vehicle-accident-fund-of-namibia/print-outdoor/dont-drink-and-drive-12196005/